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In this paper, we study the estimation of multiple carrier frequency offsets (CFOs) in a uplink orthogonal frequency division multiple access (OFDMA) system using training sequences. The proposed method can estimate the CFO values of all users in one OFDM block without knowing the channel responses. Unlike most earlier results, the proposed method does not involve any nonlinear search and thus has...
In many applications, the exact location of the sensor nodes is unknown after deployment. Localization is a process used to locate sensor nodes' positional coordinates, which is vital information. The localization is generally assisted by anchor nodes that are also sensor nodes but with known locations. Anchor nodes generally are expensive and need to be optimally placed for effective localization...
With commonness of utilizing wireless sensor networks in sensitive applications like military and civil domains, the necessity for network security and reliability has become a critical concern. In this paper, we proposed IFRP (an Intrusion/Fault tolerant Routing Protocol). IFRP uses both single and multipath to increase reliability and resiliency while considering energy efficiency. Routing has been...
Cellular operators are facing difficulties in supporting a huge increment in the subscribers due to spectrum and equipment restrictions. There have been many proposals in the area of increasing call carrying capacity such as Reuse Partitioning and Directed Retry. However, such action increases the size of the network and results to higher installation, maintenance and optimization costs for the cellular...
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